There is no proof that he killed him.可以把that改为wether吗?

there is no proof that为何不能换成it is... There is no proof that he killed him.可以把that改为wether吗? 怎么就下列句子造句go to lengths to doto musicsymbolize provided that there is no proof that so far there is no sure proof---spaceships from other plants do exist.A whether B that C if D how 英语翻译there's certainly no proof that it actually causes any damage to the eyes. 翻译 That he speaks softly is no proof that he is kind. there is no point No longer is there There is no way. there is no way there is no There Is No There is no there is no silver there is no wait there is no evidence If there is no There is no l__ in the building.We have to climb up to the 7th floor.